The Oyster Box is the best place in Bordeaux to munch on fresh Arcachon oysters. Traditionally they're served with sausage but you can have them in a number of different forms, including with that other southwest delicacy, foie gras. They'll also pack them up so you can take them away for a riverfront picnic.
Its weekday lunchtime formule (menu) comprising a sausage to start, 12 oysters, dessert and a glass of wine is a steal at €20.